Seeking Assistance with School Catchment Visualization

Hello everyone,

I am currently engaged in a project that involves visualizing school catchments. Our data layer includes attributes such as School_ID, Latitude, Longitude, Catchment_Polygon, and lists of SA1 codes. My objective is to display the catchment areas effectively, but I'm encountering some challenges in doing so. I would greatly appreciate any advice or solutions from the community. Here's a summary of my attempts and the issues I'm facing:

1.  ArcGis visual

I located an existing SA1 reference layer in the library, but I am struggling to join it with my data layer. The complexity arises because each catchment comprises multiple SA1 codes, whereas the reference layer uses object_ids. Is there a way to effectively merge these layers or any alternative approach I can use?

2. Azure Map

I've successfully created a catchment GeoJSON file. To differentiate each school, I assigned varying colors based on latitude. However, the map still appears cluttered and lacks clarity. Is there a method to dynamically highlight the catchment area of a selected school within the reference layer to improve user interaction 

3. https://geojson.io/
I attempted to use the same GeoJSON file on geojson.io, but the map renders all catchments in grey, without any distinction. It also doesn't seem to support highlighting a specific school's catchment area. Is there a way to achieve this, or am I missing something in the process?

Any insights, tips, or guidance on resolving these issues would be immensely helpful. Thank you in advance for your time and assistance!

Thanks in advance

Will